Abstract
Profilin is a low molecular weight protein involved in the organization of the mammalian and protozoan cytoskeleton as well as in signal transduction. In this study, profilin is identified as an actin-binding protein in higher plants which is present in monocot and dicot angiosperms. Birch pollen profilin and actin can be copurified as a complex, and purified recombinant birch profilin can be used as an affinity matrix to obtain birch pollen actin. The binding of 125I-labeled recombinant birch pollen profilin to plant and animal actins can be blocked by profilin-specific antibodies that react with different epitopes of birch profilin. One of the blocking antibodies was raised against the 25 COOH-terminal amino acids indicating the importance of this region in the profilactin complex formation.
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